-U and -bitcode_bundle (Xcode setting ENABLE_BITCODE=YES) cannot be used together [solution: disable bitcode]

[thatonenerd2000]

I am new to React Native. I am trying to build my app on my ios device. It is building fine in the emulator but whenever I try to do it on my ios device I am getting the following error

ld: -U and -bitcode_bundle (Xcode setting ENABLE_BITCODE=YES) cannot be used together
clang: error: linker command failed with exit code 1 (use -v to see invocation)

It used to build regularly on ios device. It stopped working after I installed firebase to it following the documentation,

https://rnfirebase.io/#3-ios-setup

Not sure but it might be a flipper issue with static libraries? But really struglling here on this for a few days. I even tried enabling and disabling the bitcode option in build setting and still the same error.

[mikehardy]

Yes, we noticed this after the initial round of patches as well: facebook/react-native#34030 (comment)

If you read that you will see:

• the two symbol definitions indeed are incompatible with bitcode so archiving will fail
• but Apple is deprecating bitcode completely since all their supported mobile devices are arm64 now
• so you may disable bitcode, using a Podfile postinstall block as mentioned in the comment:

post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      config.build_settings['ENABLE_BITCODE'] = 'NO'
    end
  end
end

However, it is really important to note that as far as I can tell, Hermes is still not working well with an iOS configuration that includes use_frameworks! in the Podfile, so I would disable it. See: reactwg/react-native-releases#26 (reply in thread)

I'm going to close this since I've answered your question - I'm sure it will get past this error if you disable bitcode - and - most importantly - you've not included the information I'd normally need to troubleshoot at all.